I'm trying to find a way to use a SPI slave (5v) with a SPI master(3v)
I'm able to read all data from the master with my atmega32u4 but sending is random. I would like not to use a level shifter because I need the pbo,1,2,3,4 pins for other 5v logic. Looks like it may work but sending is a problem.
I added a 3v6 z-diode to my MISO pin to get the voltage at near 3v but it didnt change the issue any.
In the above all data goes out as 1,45,0,5a,5a,5a,5a,5a and the in data is never the same. Looking at the wave form I think its trying to do it but maybe is having a hard time pulling low or high.